有时无法修改 Main() 方法代码,例如,您正在编写一个插件并且它由管理器实例化。
在这种情况下,我建议您将程序集和 pdb(以及 AssemblyResolve 事件中的依赖项)复制到临时位置,然后使用 Assembly.LoadFile()(而不是 LoadFrom())从那里加载它们。
优点: - 没有 dll 锁定。- 每次重新编译目标程序集时,您都可以访问新版本(这就是 .LoadFile() 的原因)。- 整个程序集在 AppDomain.CurrentDomain 中完全可用。
缺点: - 文件复制是必要的。- 无法卸载程序集,这可能会带来不便,因为没有释放资源。
问候,
PD:这段代码完成了工作。
/// <summary>
/// Loads an assembly without locking the file
/// Note: the assemblys are loaded in current domain, so they are not unloaded by this class
/// </summary>
public class AssemblyLoader : IDisposable
{
private string _assemblyLocation;
private string _workingDirectory;
private bool _resolveEventAssigned = false;
/// <summary>
/// Creates a copy in a new temp directory and loads the copied assembly and pdb (if existent) and the same for referenced ones.
/// Does not lock the given assembly nor pdb and always returns new assembly if recopiled.
/// Note: uses Assembly.LoadFile()
/// </summary>
/// <param name="assemblyOriginalPath"></param>
/// <returns></returns>
public Assembly LoadFileCopy(string assemblyLocation)
{
lock (this)
{
_assemblyLocation = assemblyLocation;
if (!_resolveEventAssigned)
{
_resolveEventAssigned = true;
AppDomain.CurrentDomain.AssemblyResolve += new ResolveEventHandler(AssemblyFileCopyResolveEvent);
}
// Create new temp directory
_workingDirectory = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
Directory.CreateDirectory(_workingDirectory);
// Generate copy
string assemblyCopyPath = Path.Combine(_workingDirectory, Path.GetFileName(_assemblyLocation));
System.IO.File.Copy(_assemblyLocation, assemblyCopyPath, true);
// Generate copy of referenced assembly debug info (if existent)
string assemblyPdbPath = _assemblyLocation.Replace(".dll", ".pdb");
if (File.Exists(assemblyPdbPath))
{
string assemblyPdbCopyPath = Path.Combine(_workingDirectory, Path.GetFileName(assemblyPdbPath));
System.IO.File.Copy(assemblyPdbPath, assemblyPdbCopyPath, true);
}
// Use LoadFile and not LoadFrom. LoadFile allows to load multiple copies of the same assembly
return Assembly.LoadFile(assemblyCopyPath);
}
}
/// <summary>
/// Creates a new copy of the assembly to resolve and loads it
/// </summary>
/// <param name="sender"></param>
/// <param name="args"></param>
/// <returns></returns>
private Assembly AssemblyFileCopyResolveEvent(object sender, ResolveEventArgs args)
{
string referencedAssemblyFileNameWithoutExtension = System.IO.Path.GetFileName(args.Name.Split(',')[0]);
// Generate copy of referenced assembly
string referencedAssemblyPath = Path.Combine(Path.GetDirectoryName(_assemblyLocation), referencedAssemblyFileNameWithoutExtension + ".dll");
string referencedAssemblyCopyPath = Path.Combine(Path.GetDirectoryName(args.RequestingAssembly.Location), referencedAssemblyFileNameWithoutExtension + ".dll");
System.IO.File.Copy(referencedAssemblyPath, referencedAssemblyCopyPath, true);
// Generate copy of referenced assembly debug info (if existent)
string referencedAssemblyPdbPath = Path.Combine(Path.GetDirectoryName(_assemblyLocation), referencedAssemblyFileNameWithoutExtension + ".pdb");
if (File.Exists(referencedAssemblyPdbPath))
{
string referencedAssemblyPdbCopyPath = Path.Combine(Path.GetDirectoryName(args.RequestingAssembly.Location), referencedAssemblyFileNameWithoutExtension + ".pdb");
System.IO.File.Copy(referencedAssemblyPath, referencedAssemblyCopyPath, true);
}
// Use LoadFile and not LoadFrom. LoadFile allows to load multiple copies of the same assembly
return Assembly.LoadFile(referencedAssemblyCopyPath);
}
public void Dispose()
{
Dispose(true);
}
private void Dispose(bool disposing)
{
if (disposing)
{
if (_resolveEventAssigned)
{
AppDomain.CurrentDomain.AssemblyResolve -= new ResolveEventHandler(AssemblyFileCopyResolveEvent);
_resolveEventAssigned = false;
}
}
}
}